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Production process for material specially used for braking part of automobile

A technology of automobile braking and production technology, which is applied to the improvement of process efficiency, electric furnace, furnace, etc., to achieve the effect of improving the metallurgical effect of molten iron, reducing defects, and reducing production costs

Inactive Publication Date: 2012-04-18
HENAN WANXIANG SYST BRAKE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The presence of iron oxide (FeO) in existing automotive brake parts lowers the melting point of any slag, and at any given temperature, more slag becomes liquid due to the lower melting point of the slag and is cast Defects are formed in the mold; and many slag inclusion defects in castings are caused by the high fluidity of high FeO and MnO slag (commonly known as manganese silicate slag) being brought into the mold. troublesome casting defect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] (1) Use 90# metallurgical silicon carbide at the ratio of 3kg / T molten iron to be added to the smelting furnace together with pig iron, scrap steel and recycle material for smelting; (2) Keep the temperature at 1580℃ for 5 minutes; (3) Inoculate with silicon barium The agent (particle size 3-8mm) is inoculated in front of the furnace and inoculated with the flow (particle size 0.3-1mm) during pouring; (4) the furnace temperature is 1510℃, and the pouring temperature is 1380℃-1420℃. The type of pig iron in the charge is: Q10, the type of scrap steel is: low-carbon steel, and the type of back charge is: common ductile iron 450 back charge for casting.

[0011] Result verification: The product has been verified by machining, and the defective waste with slag inclusion has been reduced from 30% to 0.6%, which significantly reduces the scrap rate of the steering knuckle.

Embodiment 2

[0013] (1) 90# metallurgical silicon carbide is added to the smelting furnace at the ratio of 3.5kg / T molten iron together with pig iron, scrap steel and reclaimed material for smelting; (2) Insulation and overheating at 1580℃ for 7 minutes; (3) Inoculation with silicon barium The preparation (particle size 3-8mm) is inoculated in front of the furnace and inoculated with the flow (particle size 0.3-1mm) during pouring; (4) The temperature of the furnace is 1520℃, and the pouring temperature is 1370℃-1410℃. The type of pig iron in the charge is: Z18, the type of scrap steel is: low-carbon steel, and the type of charge is: ordinary HT250 charge for casting.

[0014] Experimental verification: the hardness of the braking surface has reached HB207-215, and after mass production, the hardness difference of the braking surface is stable within 10 degrees, the uniformity of the braking surface hardness is improved, and the cutting performance of the brake disc is also significantly impro...

Embodiment 3

[0016] (1) 90# metallurgical silicon carbide is added to the smelting furnace at the ratio of 4kg / T molten iron together with pig iron, scrap steel, and reclaimed material for smelting; (2) Insulation and overheating at 1580℃ for 10 minutes; (3) Using silicon barium inoculant (Grain size 3-8mm) Carry out pre-furnace inoculation and flow-in incubation (grain size 0.3-1mm) during pouring; (4) The exit temperature is 1550℃, and the pouring temperature is 1380℃-1420℃. The type of pig iron in the charge is: Q10, the type of scrap steel is: low carbon steel, and the type of back charge is: ordinary ductile iron 450 back charge for casting.

[0017] The invention uses 90 # Metallurgical silicon carbide substitute 75 # The production and processing of ferrosilicon can improve the metallurgical quality of molten iron, greatly reduce the slag inclusion defects of castings, and significantly improve the hardness uniformity of gray iron brake discs, thereby improving the cutting performance o...

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PUM

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Abstract

The invention provides a production process for a material specially used for a braking part of an automobile. Technical key points for the process lie in that the process comprises the following steps: (1) adding 90# metallurgical silicon carbide according to a proportion that each T of molten iron contains 3 to 4 kg of 90# metallurgical silicon carbide, pig iron, waste steel and returns into a melting furnace together for melting; (2) carrying out insulation and overheating at a temperature of 1580 DEG C for 5 to 10 minutes; (3) carrying out pre-casting inoculation with a silicon-barium inoculant (having a granularity of 3 to 8 mm) and stream inoculation during casting with the silicon-barium inoculant (having a granularity of 0.3 to 1 mm); (4) controlling a discharging temperature to be 1510 to 1550 DEG C and a casting temperature to be 1380 to 1420 DEG C. When used for brake discs, steering knuckles and clamp supports, the material prepared in the invention enables a metallurgical effect of iron liquid to be greatly improved, defects caused by running slag to be substantially reduced, hardness difference between the upper and lower brake surfaces of a brake disc to be controlled within 10 degrees and production cost to be substantially reduced.

Description

Technical field: [0001] The invention relates to a material formed by casting, in particular to a production process of a special material for automobile brake parts. Background technique: [0002] Automobile brake disc is a key component of automobile brake system. The uneven hardness of brake disc is one of the main reasons that lead to poor processing performance, high processing cost and brake noise during braking. [0003] The presence of iron oxide (FeO) in the existing automobile brake parts can reduce the melting point of any slag. At any given temperature, because the melting point of the slag drops, more slag becomes liquid and is cast Defects are formed in the mold; and many slag inclusion defects in castings are caused by the high fluidity of FeO and MnO slag (usually called manganese silicate slag) being brought into the mold, which is encountered by casting technicians Very difficult casting defect. Summary of the invention: [0004] The purpose of the present in...

Claims

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Application Information

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IPC IPC(8): C21C5/52B22D1/00
CPCY02P10/20
Inventor 周长路孙科赵海广熊柏松赵建喜王耿罗继永
Owner HENAN WANXIANG SYST BRAKE